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~..NGINEERING INTER PR3TATIONS, <br /> <br /> In this table the soils of the Houl~'er Area are rated <br /> according to their suitability as a source of road fill, <br /> sand snd gravel and topsoil. Other columns, Hams the <br /> soil features that affect the location of pond reservoir <br /> areas, embankments and dikes, drainage of cropland snd <br /> pasture, irrigation, snd terraces snd diversions, The <br /> estimated interprststions sre based on the eneineerinz <br /> properties o° soils, on test data soils in survey areas <br /> nearby or,adloining, and on the experience of en ginee:^s <br /> and soil scientists o'-' the Boulder Area, <br />°.oil suitability is rated bar the terms ¢ood, fair and <br />poor, ^:ood means soil properties generally favorable <br />for t''^.e rated use, or in other words, limitations that <br />are minor and easil;r overcome, ?air means that some <br />soil properties sre unfavorable but can be overcome or <br />modified b': special planning an3 design. Poor ;~esns <br />soil properties so unfavorable and so difficult to <br />correct or overcome as to require ms,jor soil reclama- <br />tion, special designs, or intensive maintenance, <br />Road fill is soil material uszd in eabsn`~cments for roads, <br />The s~iitabilit;- ratings reflect (1) the predicted per- <br />formance of soil after it has been placed in sn embsnk- <br />• ment that has been properl? con plcced and provided with <br />sdecuate drsinsEe snd (2) the relative else of excava- <br />ting the material st borrow areas, <br />Sand and gravel sre used in Brest cuantities in many kinds <br />of construction. The ratings in the table provide <br />guidance shout adhere to look for probable sources, A <br />soil rated es s good or fair source of sand or q_rsvel <br />Qenerall? has s is°ar at least 3 feet thick, the top of <br />which is within a depth of 5 feat, The ratings do not <br />take into account thic',cness of overburden, location of <br />the water tables, or other factors that affect mining ~~f <br />the materials, and neither do they indicate quality <br />of the deposit. <br />Topsoil is used for topdressing an area where ve~etati~~n <br />is to be established and maintained, Suitabilit? is <br />affected mainly by ease of working end spreadipa the <br />soil material, as for preparing s seedbed; natural <br />fertilit;* of the material, or the response of plants <br />when fertilizer is applied; and absence of substances <br />toxic to plants, Texture of the soil material and its <br />content of stone fragments are characteristics that <br />affect suitability, but also considered in the ratings <br />is damage that will result at the area from which top- <br />soil is taken. <br /> <br /> <br />~~ <br />1 <br /> <br />